Doorlock



v I Filed April 24, 19 v sheetssseet 1 9 S. RAYMOND DOORLOCK' InvenTor. samuel' Raymond byM ATTys,

Fig l S. RAYMOND A DOORLOCK Filed April 24 1925 2 Sheets-Sheet 2 Patented July 13, 1926.

UNITED STATES DOORLOCK.

Application filed April 24, 1925. Serial No. 25,486.

This invention relates to door locks and particularly to an attachment which is located on the inside of the door and is designed to have an interlocking engagement is with the key and thus prevent it from either being rotated to unlock the door or from being pushed out from the look by an unauthorized person on the outsideof the door. 7 In order to give an understanding of the invention I have illustrated in the drawings some selected embodiments. thereof which will now be described after which the novel features will bepointed out in the appended claims. V In the drawings,Fig. 1 is a front view of a door lock having my improvements applied thereto;

Fig. 2 is a vertical sectional view of the device shown in Fig. 1; c Fig. 3 is a view of the key; v Fig. 4C is a front view of a portion of the door showing a difi'erent embodiment of the invention;

Fig. 5 is a side view of Fig. 4 housing 25 in section.

In the drawings 1 indicates a portion of a door to which is secured the usual lock comprising a locking bolt 17 which is actuated by a key 5. 3 indicates the usual knob by which the latch 18 is actuated and 2 represents the housing plate which is secured to the door and through which the knob 3 eX- tends and which is provided with the ke hole slot 4. These parts are such as are usually found in door locks and form no part of my present invention.

In locks of this type which are commonly used in houses and other buildings it sometimes happens that it is possible for a person on the outside of the door to manipulate the key by the use of specially designed tools thereby to' turn the key into position in which it may be pushed from the keyhole slot. Havin thus removed the key an expert lock pic er may pick the lock and gain entrance to the room.

My invention is designed to prevent this from occurring and it comprises a key-locking member attached to the inside of the door and adapted to have interlocking engagement with the key thereby to Prevent it from being turned or pushed out of the look. In the embodiment shown in Figs. 1 and 2 this key-locking member is a plate or arm 6 ii which is pivotally connected to the casing 2 showing the of the door look so that it can be swung upwardly into its inoperative position as shown in dotted lines Fig. 2 or downwardly in its operative position in which it has interlocking engagement with the key 5.

The locking plate 6 is shown as having a projection or protuberance 8 on its under face which is adapted to enter the opening 9 of t key when said locking member is in its; operative position. When'this pro-- jection occupies the epening 9 of the key as shown in full lines Figs 1 and 2 it will be impossible either to turn the key from the outside or to push the key out of the lock.

The connection between the member 6 and I the housing 2 of the door lock is a yielding connection which will yieldingly hold the locking plate in either its inoperative or operative position. The locking plate is hingedly mounted on a wire 10 which extends transversely through the plate. said wire being bent laterally as shown at ll and the lateral portion extending through openings 12 in the housing 2. Each end of the wire is then bent upwardly and then downwardly to form the loop 13.

Each loop has secured thereto one end of a spring 14, the other end of the spring being anchored to some fixed point such for instance as one of the screws'15 by which the housing 2 is secured to the door 1. The lateral bent portions 11 incline upwardly slightly so that the pull of the springs 1 1 tends to hold the inner edge of the plate 6 against the housing or face plate 2. p

The inner edge of said plate 6 is formed with anose or cam'face 16 which is eccentric with the pivot pin 10. When the locking member 6 is turned upwardly from the full to the dotted line position Fig. 2 the nose 16 crowds against the face 7 of the housing 2 'and forces the pivotal wire 11 away from said face plate slightly thus drawing the arms 11 through the openings 12, this movement being against the action of the springs 14. After the nose 16 passes the horizontal line then the tendency of the spring 14 will be to assist in swinging the plate 6 into its inoperative position shown in dotted lines Fig. 2. Similarly when the locking plate is swung in its operative position the first part of the movement is against the action of the springs 14L and when the nose 16 passes the dead center then the springs tend to throw the locking plate downwardly into its operaall tive position and also yieldingly maintain it in such position.

In order that the device herein shown may function properly it is necessary that the key should be left in the lock with the opening 9 in a horizontal plane so that the protuberancc 8 may be carried into the opening when the plate is swung into its operative position.

In Figs. 4 and 5 I have illustrated a different embodiment of my invention wherein the key-locking member is entirely separate and distinct from the door lock or the housing 2. In this embodiment of the invention the key-locking member is indicated at 19 and is shown as a U-shaped member having the ends of its arms 20 bent into hooks 21 which are adapted to hook into the opening 9 of the key. This key-locking member has a stem 23 projecting therefrom which is connected to a spring 24 that is located in a housing 25, the latter having ears 26 by which it may be screwed to the inside of the door. hen the key-locking device is not in use the contracting action of the spring 24 will retain it in the dotted line position in which it is beneath the key. When in this position it does not interfere in any way with the operation of the key. The locking of the key involves merely turning the key so that the opening 9 will be in a horizontal position and then raising the locking member and hooking the hooks 21 into said opening 9 of the key. This device will not only preventthe key from being turned but will also prevent it from being pushed out of the keyhole.

The construction shown in Figs. 4 and 5 has the advantage that the key-locking device is separate from the door iock and may be sold separately. This separate locking device can be quicklyapplied to any door regardless of the land of lock with which the door is equipped.

The construction shown in Figs. 1 and 2 involves a special form of lock and housing.

I claim:

1. In a device of the class described, the combination with a door lock comprising a housing having a keyhole slot, a key-locking member. a pivotal connection therefor comprising a wire extending transversely through the key-locking member, said ire presenting laterally-cxtending arms which extend through the housing. and springs within the housing connected. to said arms.

2. In a device of the class described, the combination with a door lock comprising a housing having a keyhole slot, a key-locking member, a pivotal connection therefor comprising a wire extending transversely through the key-locking member, said wire presenting laterally-extending arms which extend through the housing, and springs within the housing connected to said arms, the inner edge of said locking arm presenting a nose which co-operates with the spring to hold the member yieldingly in either its operative or inoperative position.

3. In a device of the class described, the combination with a door lock, of a key for operating the same, said key having an openin in the end thereof, a U-shaped key-locking member, the ends of its arms being bent backwardly to form hooks adapted to hook into the opening of the key, and a spring acting on said locking member and yieldingly holding it in locln'ng engagement with the key.

4. In a device of the class described, the combination with a door lock, of a key for operating the same, a U-shaped locking member, the ends of the arms of said member being bent backwardly to form hooks adapted to hook into the opening of the key. a housing secured to the door and a spring within the housing connected to said keylocking member.

In testimony whereof, I have signed my name to this specification.

SAMUEL RAYMOND. 

